[libc-commits] [libc] p/libc fenv safe test (PR #89658)

Roland McGrath via libc-commits libc-commits at lists.llvm.org
Mon Apr 22 12:49:26 PDT 2024


https://github.com/frobtech created https://github.com/llvm/llvm-project/pull/89658

- [mlir] fix typo in mem2reg [NFC]
- [InstCombine] Update BranchProbabilityAnalysis cache result (#86470)
- [SPIRV][HLSL] Add mad intrinsic lowering for spirv (#89130)
- [AArch64] Add phase ordering tests for some basic interleaving vectorization patterns. NFC
- [LV] Fix warning about Mask being set twice. NFC
- [nfc][github] subscribe myself to MLIR Mem2Reg PRs
- [clang][Interp] Change array index types in OffsetHelper
- [clang-repl] Keep the first llvm::Module empty to avoid invalid memory access. (#89031)
- [memprof] Accept Schema in the constructor of RecordWriterTrait (NFC) (#89486)
- [Interpreter] Fix warnings
- Revert "[clang-repl] Keep the first llvm::Module empty to avoid invalid memory access. (#89031)"
- Reland "[clang-repl] Keep the first llvm::Module empty to avoid invalid memory access. (#89031)"
- Revert "Reland "[python] Bump Python minimum version to 3.8 (#78828)""
- [X86] X86LowerTileCopy: Find dead register to use to prevent save-reload of tile register (#83628)
- [mlir][python] Fix generation of Python bindings for `async` dialect (#75960)
- [memprof] Omit the key length for the call stack table (#89510)
- [RISCV] Remove extra indentation from RISCVProcessors.td.
- [tidy] update check list [NFC]
- [InstCombine] Add check to avoid dependent optimization order, NFC
- [InstCombine] Optimize powi(X, Y)/ (X * Z) with Ofast
- [clang][Interp][NFC] Change pointer offset to uint64
- Revert "[X86] X86LowerTileCopy: Find dead register to use to prevent save-reload of tile register (#83628)"
- [Clang] Do not try to diagnose parameter packs in invalid pack expressions (#89257)
- [MLIR] Generalize expand_shape to take shape as explicit input (#69267)
- Revert "[MLIR] Generalize expand_shape to take shape as explicit input" (#89540)
- [AArch64] Add costs for LD3/LD4 shuffles.
-  [InstCombine] Fix unexpected overwriting in `foldSelectWithSRem` (#89539)
- [Transforms] Remove extraneous ArrayRef (NFC) (#89535)
- [ValueTracking] Combine variable declaration with its only assignment. NFC (#89526)
- [X86][MC] Error out for CMPCCXADD on 32 bit targets. (#88672)
- [MLIR][Linalg] Enable fuse consumer (#85528)
- [LTO] Allow target-specific module splittting (#83128)
- [clang][dataflow] Model conditional operator correctly. (#89213)
- Revert "[clang][dataflow] Model conditional operator correctly." (#89577)
- [InstCombine] Fold fabs over selects (#86390)
- [llvm-split] Require x86-registered-target for target-specific-split.ll
- [SelectionDAG] Remove redundant KnownBits smin and smax operations (#89519)
- [AArch64] Add tests for more undef lanes on zip/uzp. NFC
- [VectorCombine] Add test coverage for #89390
- [VectorCombine] foldShuffleOfBinops - don't fold shuffle(divrem(x,y),divrem(z,w)) if mask contains poison
- [clang][Interp] Create full type info for dummy pointers
- Reland "[clang] CTAD: Fix require-clause is not transformed." (#89476)
- Mark `mlir::Value::isa/dyn_cast/cast/...` member functions deprecated. (#89238)
- CodeGen: Strengthen definition of F{MIN|MAX}NUM_IEEE nodes (#85195)
- [llvm][bazel] Fix BUILD after e86ebe4ff8705ef30b332e2104ed1c84fc729966.
- [llvm-split] Add missing TargetParser dependency
- Revert "[clang][Interp] Create full type info for dummy pointers"
- [clang][Interp][NFC] Get ComplexType directly
- [clang][Interp][NFC] Test out-of-bounds access on vectors
- [libclc] Fix build with Unix Makefiles (#89147)
- [clang][Interp] Support ImplicitArrayInitExpr for vectors
- [flang] de-duplicate AbstractResult pass (#88867)
- [DAG] visitOR/visitORLike - merge repeated SDLoc calls.
- clang: Remove unnecessary pointer bitcast
- [DAG] visitORCommutative - use sd_match to reduce the need for commutative operand matching. NFCI.
- [AArch64][GlobalISel] Combine Shuffles of G_CONCAT_VECTORS (#87489)
- Revert "[TBAA] Add verifier for tbaa.struct metadata (#86709)"
- [flang][driver] Avoid mentions of Clang in Flang's command line reference. (#88932)
- [flang] Default -g to full debug info. (#89418)
- AMDGPU: Simplify DS atomicrmw fadd handling (#89468)
- [Clang] Fix template alias default DWARF version (#89594)
- Fix DW_TAG_template_alias refs in llvm-dwarfdump --verify (#89589)
- [llvm-split] Correctly deallocate TargetMachine
- [KnownBitsTest] Common up isCorrect and isOptimal. NFC. (#89585)
- [VPlan] Remove custom checks for EVL placement in verifier (NFCI).
- [KnownBitsTest] Print name of function when exhaustive tests fail (#89588)
- AMDGPU: Refactor atomicrmw fadd expansion logic (NFC) (#89469)
- [NFC] Fix comments in PassBuilder functions (#89513)
-  [clang] MveEmitter: Pass Args as a const reference  (#89551)
- [RemoveDIs] Make verify-uselistorder preserve the input debug info format (#87789)
- [clang][Interp][NFC] getRecord() might return null
- [clang][Interp] Fix casting pointers to int128
- [KnownBitsTest] Standardize variable names in exhaustive tests
- [libc++] Don't commit libcxx.imp (#89391)
- [libc++] Remove stray CMake install step for modulemap file (#89394)
- [mlir] fix latex formulas in the tutorial
- [mlir][Hoisting] Hoisting vector.extract/vector.broadcast pairs (#86108)
- [X86] Allow input vector extracted from larger vector when combining to VPMADDUBSW (#89584)
- [AArch64] Add some tests for reassociated addressing modes. NFC
- [Clang] Fix a crash introduced in PR#88666 (#89567)
- [LAA] Document reasoning in multiple places in isDependent (NFC). (#89381)
- [flang][OpenMP] Allow common blocks in nested directives (#88430)
- [mlir] fix polynomial dialect docs
- [clang][Interp][NFC] Refactor Program::getGlobal()
- [clang][Interp] Remove faulty assertion
- [clang][Interp] Implement C++23 [[assume]] support
- [SLP]Fix PR89438: check for all tree entries for the resized value.
- [gn] port e86ebe4ff870 (llvm-split target dep)
- [libc++][NFC] Fix unparenthesized comma expression in mem-initializer (#89605)
- [lldb][DWARF] Remove m_forward_decl_die_to_compiler_type as it never actually being used. (#89427)
- [AST] Dump argument types for TypeTraitExpr. (#89370)
- [LAA] Add etra tests with strides with different signs.
- [VectorCombine] foldShuffleOfShuffles - fold "shuffle (shuffle x, undef), (shuffle y, undef)" -> "shuffle x, y" (#88743)
- [SystemZ][z/OS] Implement llvm.returnaddress for XPLINK (#89440)
- [SLP][NFC]Add a test with incorrect size of the external user detection.
- [SLP]Fix a check for multi-users for icmp user.
- [SLP]Fix PR89614: phis can be reordered, if reuses are not empty.
- Reapply "[Clang][Sema] Fix crash when 'this' is used in a dependent class scope function template specialization that instantiates to a static member function (#87541, #88311)" (#88731)
- [OpenACC] Implement 'num_gangs' sema for compute constructs (#89460)
- [C23] Select the correct promoted type for a bit-field (#89254)
- [NVPTX][NFCI] Use DataLayout to determine short shared/local/const pointers (#89404)
- [RISCV] Precommit stack protector checks for Linux and Android (#87679)
- [Clang][Sema] Remove unused function after #88731 (#89618)
- [compiler-rt][ctx_instr] Add `ctx_profile` component (#89304)
- [SLP]Introduce transformNodes() and transform loads + reverse to strided loads.
- [X86] gfni-funnel-shifts.ll - add vXi8 variable/splat/constant test coverage
- Revert "[compiler-rt][ctx_instr] Add `ctx_profile` component" (#89625)
- [SPIRV][HLSL] map lerp to Fmix (#88976)
- [Clang] Fix crash on invalid size in user-defined `static_assert` message (#89420)
- [Offload] Move `/openmp/libomptarget` to `/offload` (#75125)
- [RemoveDIs] Preserve debug info format in llvm-reduce (#89220)
- [flang][cuda] fix parsing of cuda_kernel (#89613)
- Carving out -Wformat warning about scoped enums into a subwarning (#88595)
- [SystemZ][NFC] Use new getPointerSize function (#89623)
- [clangd] Fix unittests in TargetDeclTest bucket (#89630)
- [Clang] Fix __is_trivially_equaltiy_comparable documentation (#88528)
- [RISCV] Add extension information to RISCVFeatures.td. NFC (#89326)
- [clang][CoverageMapping] do not emit a gap region when either end doesn't have valid source locations (#89564)
- [lldb][MinidumpFileBuilder] Fix addition of MemoryList steam (#88564)
- [SPIR-V] Emit SPIR-V generator magic number and version (#87951)
- [flang][OpenMP] Concatenate begin and end clauses into single list (#89090)
- [clang-tidy] Improved --verify-config when using literal style in config file (#85591)
- [MIPS]: Rework atomic max/min expand for subword (#89575)
- [lldb][NFC] Remove unused pexpect/ptyprocess (#89609)
- [RISCV] Add freeze when expanding mul by constant to two or more uses (#89290)
- [BitInt] Expose a _BitInt literal suffix in C++ (#86586)
- [libc] don't over include stdlib in the hdr declaring bsearch (#89471)
- [llvm] Add support for zero-width integers in MathExtras.h (#87193)
- [libc][docs] codify Policy on Assembler Sources (#88185)
- [libc][POSIX][pthreads] implement pthread_rwlockattr_t functions (#89322)
- [RISCV][clang] Don't enable -mrelax-all for -O0 on RISC-V (#88538)
- [Offload] Fix per-target install directory (#89645)
- [llvm-readobj] Remove --raw-relr
- [libc] Make fenv and math tests preserve fenv_t state


>From eb479dc566688fd79cc63168120fc3422815e473 Mon Sep 17 00:00:00 2001
From: Roland McGrath <mcgrathr at google.com>
Date: Sat, 20 Apr 2024 01:00:22 -0700
Subject: [PATCH] [libc] Make fenv and math tests preserve fenv_t state

This adds a new test fixture class FEnvSafeTest (usable as a base
class for other fixtures) that ensures each test doesn't perturb
the `fenv_t` state that the next test will start with.  It also
provides types and methods tests can use to explicitly wrap code
under test either to check that it doesn't perturb the state or
to save and restore the state around particular test code.

All the fenv and math tests are updated to use this so that none
can affect another.  Expectations that code under test and/or
tests themselves don't perturb state can be added later.
---
 libc/test/UnitTest/CMakeLists.txt             |   2 +
 libc/test/UnitTest/FEnvSafeTest.cpp           |  84 +++++++++++++++
 libc/test/UnitTest/FEnvSafeTest.h             | 101 ++++++++++++++++++
 libc/test/src/fenv/CMakeLists.txt             |  16 +++
 .../test/src/fenv/enabled_exceptions_test.cpp |  23 ++--
 libc/test/src/fenv/exception_flags_test.cpp   |  12 ++-
 libc/test/src/fenv/exception_status_test.cpp  |  43 ++++----
 libc/test/src/fenv/excepts.h                  |  24 +++++
 libc/test/src/fenv/feclearexcept_test.cpp     |  21 ++--
 libc/test/src/fenv/feenableexcept_test.cpp    |   7 +-
 libc/test/src/fenv/feholdexcept_test.cpp      |   7 +-
 libc/test/src/fenv/feupdateenv_test.cpp       |   5 +-
 libc/test/src/fenv/getenv_and_setenv_test.cpp |  14 +--
 libc/test/src/fenv/rounding_mode_test.cpp     |   9 +-
 libc/test/src/math/CeilTest.h                 |   3 +-
 libc/test/src/math/CopySignTest.h             |   3 +-
 libc/test/src/math/FAbsTest.h                 |   3 +-
 libc/test/src/math/FDimTest.h                 |   3 +-
 libc/test/src/math/FMaxTest.h                 |   3 +-
 libc/test/src/math/FMinTest.h                 |   3 +-
 libc/test/src/math/FModTest.h                 |   3 +-
 libc/test/src/math/FloorTest.h                |   3 +-
 libc/test/src/math/FmaTest.h                  |   3 +-
 libc/test/src/math/FrexpTest.h                |   3 +-
 libc/test/src/math/HypotTest.h                |   3 +-
 libc/test/src/math/ILogbTest.h                |   3 +-
 libc/test/src/math/LdExpTest.h                |   3 +-
 libc/test/src/math/LogbTest.h                 |   3 +-
 libc/test/src/math/ModfTest.h                 |   3 +-
 libc/test/src/math/NextAfterTest.h            |   3 +-
 libc/test/src/math/RIntTest.h                 |   3 +-
 libc/test/src/math/RemQuoTest.h               |   3 +-
 libc/test/src/math/RoundEvenTest.h            |   3 +-
 libc/test/src/math/RoundTest.h                |   3 +-
 libc/test/src/math/RoundToIntegerTest.h       |   5 +-
 libc/test/src/math/SqrtTest.h                 |   3 +-
 libc/test/src/math/TruncTest.h                |   3 +-
 .../exhaustive/fmod_generic_impl_test.cpp     |   3 +-
 libc/test/src/math/smoke/CanonicalizeTest.h   |   3 +-
 libc/test/src/math/smoke/CeilTest.h           |   3 +-
 libc/test/src/math/smoke/CopySignTest.h       |   3 +-
 libc/test/src/math/smoke/FAbsTest.h           |   3 +-
 libc/test/src/math/smoke/FDimTest.h           |   3 +-
 libc/test/src/math/smoke/FMaxTest.h           |   3 +-
 libc/test/src/math/smoke/FMaximumMagNumTest.h |   3 +-
 libc/test/src/math/smoke/FMaximumMagTest.h    |   3 +-
 libc/test/src/math/smoke/FMaximumNumTest.h    |   3 +-
 libc/test/src/math/smoke/FMaximumTest.h       |   3 +-
 libc/test/src/math/smoke/FMinTest.h           |   3 +-
 libc/test/src/math/smoke/FMinimumMagNumTest.h |   3 +-
 libc/test/src/math/smoke/FMinimumMagTest.h    |   3 +-
 libc/test/src/math/smoke/FMinimumNumTest.h    |   3 +-
 libc/test/src/math/smoke/FMinimumTest.h       |   3 +-
 libc/test/src/math/smoke/FModTest.h           |   3 +-
 libc/test/src/math/smoke/FloorTest.h          |   3 +-
 libc/test/src/math/smoke/FmaTest.h            |   3 +-
 libc/test/src/math/smoke/FrexpTest.h          |   3 +-
 libc/test/src/math/smoke/FromfpTest.h         |   3 +-
 libc/test/src/math/smoke/FromfpxTest.h        |   3 +-
 libc/test/src/math/smoke/HypotTest.h          |   3 +-
 libc/test/src/math/smoke/ILogbTest.h          |   3 +-
 libc/test/src/math/smoke/LdExpTest.h          |   3 +-
 libc/test/src/math/smoke/LogbTest.h           |   3 +-
 libc/test/src/math/smoke/ModfTest.h           |   3 +-
 libc/test/src/math/smoke/NextAfterTest.h      |   3 +-
 libc/test/src/math/smoke/NextDownTest.h       |   3 +-
 libc/test/src/math/smoke/NextTowardTest.h     |   3 +-
 libc/test/src/math/smoke/NextUpTest.h         |   3 +-
 libc/test/src/math/smoke/RIntTest.h           |   3 +-
 libc/test/src/math/smoke/RemQuoTest.h         |   3 +-
 libc/test/src/math/smoke/RoundEvenTest.h      |   3 +-
 libc/test/src/math/smoke/RoundTest.h          |   3 +-
 libc/test/src/math/smoke/RoundToIntegerTest.h |   5 +-
 libc/test/src/math/smoke/SqrtTest.h           |   3 +-
 libc/test/src/math/smoke/TruncTest.h          |   3 +-
 libc/test/src/math/smoke/UfromfpTest.h        |   3 +-
 libc/test/src/math/smoke/UfromfpxTest.h       |   3 +-
 libc/test/src/math/smoke/nan_test.cpp         |   3 +-
 libc/test/src/math/smoke/nanf128_test.cpp     |   3 +-
 libc/test/src/math/smoke/nanf_test.cpp        |   3 +-
 libc/test/src/math/smoke/nanl_test.cpp        |   3 +-
 81 files changed, 443 insertions(+), 130 deletions(-)
 create mode 100644 libc/test/UnitTest/FEnvSafeTest.cpp
 create mode 100644 libc/test/UnitTest/FEnvSafeTest.h
 create mode 100644 libc/test/src/fenv/excepts.h

diff --git a/libc/test/UnitTest/CMakeLists.txt b/libc/test/UnitTest/CMakeLists.txt
index 9113eca388e05b..302af3044ca3d6 100644
--- a/libc/test/UnitTest/CMakeLists.txt
+++ b/libc/test/UnitTest/CMakeLists.txt
@@ -111,8 +111,10 @@ add_header_library(
 add_unittest_framework_library(
   LibcFPTestHelpers
   SRCS
+    FEnvSafeTest.cpp
     RoundingModeUtils.cpp
   HDRS
+    FEnvSafeTest.h
     FPMatcher.h
     RoundingModeUtils.h
   DEPENDS
diff --git a/libc/test/UnitTest/FEnvSafeTest.cpp b/libc/test/UnitTest/FEnvSafeTest.cpp
new file mode 100644
index 00000000000000..43aebc3f36e7b3
--- /dev/null
+++ b/libc/test/UnitTest/FEnvSafeTest.cpp
@@ -0,0 +1,84 @@
+//===-- FEnvSafeTest.cpp ---------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===---------------------------------------------------------------------===//
+
+#include "FEnvSafeTest.h"
+
+#include "src/__support/FPUtil/FEnvImpl.h"
+#include "src/__support/macros/properties/architectures.h"
+
+namespace LIBC_NAMESPACE::testing {
+
+void FEnvSafeTest::PreserveFEnv::check() {
+  fenv_t after;
+  test.get_fenv(after);
+  test.expect_fenv_eq(before, after);
+}
+
+void FEnvSafeTest::TearDown() {
+  if (!should_be_unchanged) {
+    restore_fenv();
+  }
+}
+
+void FEnvSafeTest::get_fenv(fenv_t &fenv) {
+  ASSERT_EQ(LIBC_NAMESPACE::fputil::get_env(&fenv), 0);
+}
+
+void FEnvSafeTest::set_fenv(const fenv_t &fenv) {
+  ASSERT_EQ(LIBC_NAMESPACE::fputil::set_env(&fenv), 0);
+}
+
+void FEnvSafeTest::expect_fenv_eq(const fenv_t &before_fenv,
+                                  const fenv_t &after_fenv) {
+#if defined(LIBC_TARGET_ARCH_IS_AARCH64)
+  using LIBC_NAMESPACE::fputil::FEnv::FPState;
+  const FPState &before_state = reinterpret_cast<const FPState &>(before_fenv);
+  const FPState &after_state = reinterpret_cast<const FPState &>(after_fenv);
+
+  EXPECT_EQ(before_state.ControlWord, after_state.ControlWord);
+  EXPECT_EQ(before_state.StatusWord, after_state.StatusWord);
+
+#elif defined(LIBC_TARGET_ARCH_IS_X86) && !defined(__APPLE__)
+  using LIBC_NAMESPACE::fputil::internal::FPState;
+  const FPState &before_state = reinterpret_cast<const FPState &>(before_fenv);
+  const FPState &after_state = reinterpret_cast<const FPState &>(after_fenv);
+
+#if defined(_WIN32)
+  EXPECT_EQ(before_state.control_word, after_state.control_word);
+  EXPECT_EQ(before_state.status_word, after_state.status_word);
+#elif defined(__APPLE__)
+  EXPECT_EQ(before_state.control_word, after_state.control_word);
+  EXPECT_EQ(before_state.status_word, after_state.status_word);
+  EXPECT_EQ(before_state.mxcsr, after_state.mxcsr);
+#else
+  EXPECT_EQ(before_state.x87_status.control_word,
+            after_state.x87_status.control_word);
+  EXPECT_EQ(before_state.x87_status.status_word,
+            after_state.x87_status.status_word);
+  EXPECT_EQ(before_state.mxcsr, after_state.mxcsr);
+#endif
+
+#elif defined(LIBC_TARGET_ARCH_IS_ARM) && defined(__ARM_FP)
+  using LIBC_NAMESPACE::fputil::FEnv;
+  const FEnv &before_state = reinterpret_cast<const FEnv &>(before_fenv);
+  const FEnv &after_state = reinterpret_cast<const FEnv &>(after_fenv);
+
+  EXPECT_EQ(before_state.fpscr, after_state.fpscr);
+
+#elif defined(LIBC_TARGET_ARCH_IS_ANY_RISCV)
+  const uint32_t &before_fcsr = reinterpret_cast<const uint32_t &>(before_fenv);
+  const uint32_t &after_fcsr = reinterpret_cast<const uint32_t &>(after_fenv);
+  EXPECT_EQ(before_fcsr, after_fcsr);
+
+#else
+  // No arch-specific `fenv_t` support, so nothing to compare.
+
+#endif
+}
+
+} // namespace LIBC_NAMESPACE::testing
diff --git a/libc/test/UnitTest/FEnvSafeTest.h b/libc/test/UnitTest/FEnvSafeTest.h
new file mode 100644
index 00000000000000..a7565456c68a62
--- /dev/null
+++ b/libc/test/UnitTest/FEnvSafeTest.h
@@ -0,0 +1,101 @@
+//===-- FEnvSafeTest.h -----------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===---------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TEST_UNITTEST_FPENVSAFE_H
+#define LLVM_LIBC_TEST_UNITTEST_FPENVSAFE_H
+
+#include "hdr/types/fenv_t.h"
+#include "src/__support/CPP/utility.h"
+#include "test/UnitTest/Test.h"
+
+namespace LIBC_NAMESPACE::testing {
+
+// This provides a test fixture (or base class for other test fixtures) that
+// asserts that each test does not leave the FPU state represented by `fenv_t`
+// (aka `FPState`) perturbed from its initial state.
+class FEnvSafeTest : public Test {
+public:
+  void TearDown() override;
+
+protected:
+  // This is an RAII type where `PreserveFEnv preserve{this};` will sample the
+  // `fenv_t` state and restore it when `preserve` goes out of scope.
+  class PreserveFEnv {
+    fenv_t before;
+    FEnvSafeTest &test;
+
+   public:
+    explicit PreserveFEnv(FEnvSafeTest *self) : test{*self} {
+      test.get_fenv(before);
+    }
+
+    // Cause test expectation failures if the current state doesn't match what
+    // was captured in the constructor.
+    void check();
+
+    // Restore the state captured in the constructor.
+    void restore() { test.set_fenv(before); }
+
+    ~PreserveFEnv() { restore(); }
+  };
+
+  // This is an RAII type where `CheckFEnv check{this};` will sample the
+  // `fenv_t` state and require it be the same when `check` goes out of scope.
+  struct CheckFEnv : public PreserveFEnv {
+    using PreserveFEnv::PreserveFEnv;
+
+    ~CheckFEnv() { check(); }
+  };
+
+  // This calls callable() and returns its value, but has EXPECT_* failures if
+  // the `fenv_t` state is not preserved by the call.
+  template <typename T> decltype(auto) check_fenv_preserved(T &&callable) {
+    CheckFEnv check{this};
+    return cpp::forward<T>(callable)();
+  }
+
+  // This calls callable() and returns its value, but saves and restores the
+  // `fenv_t` state around the call.
+  template <typename T>
+  auto with_fenv_preserved(T &&callable)
+      -> decltype(cpp::forward<decltype(callable)>(callable)()) {
+    PreserveFEnv preserve{this};
+    return cpp::forward<T>(callable)();
+  }
+
+  // A test can call these to indicate it will or won't change `fenv_t` state.
+  void will_change_fenv() { should_be_unchanged = false; }
+  void will_not_change_fenv() { should_be_unchanged = true; }
+
+  // This explicitly resets back to the "before" state captured in SetUp().
+  // TearDown() always does this, but should_be_unchanged controls whether
+  // it also causes test failures if a test fails to restore it.
+  void restore_fenv() { check.restore(); }
+
+private:
+  void get_fenv(fenv_t &fenv);
+  void set_fenv(const fenv_t &fenv);
+  void expect_fenv_eq(const fenv_t &before_fenv, const fenv_t &after_fenv);
+
+  CheckFEnv check{this};
+
+  // TODO: Many tests fail if this is true. It needs to be figured out whether
+  // the state should be preserved by each library function under test, and
+  // separately whether each test itself should preserve the state.  It
+  // probably isn't important that tests be explicitly written to preserve the
+  // state, as the fixture can (and does) reset it--the next test can rely on
+  // getting "normal" ambient state initially.  For library functions that
+  // should preserve the state, that should be checked after each call, not
+  // just after the whole test.  So they can use check_fenv_preserved or
+  // with_fenv_preserved as appropriate.
+  bool should_be_unchanged = false;
+};
+
+} // namespace LIBC_NAMESPACE::testing
+
+#endif // LLVM_LIBC_TEST_UNITTEST_FPENVSAFE_H
diff --git a/libc/test/src/fenv/CMakeLists.txt b/libc/test/src/fenv/CMakeLists.txt
index f277b65e2d42be..b776f9a0706e86 100644
--- a/libc/test/src/fenv/CMakeLists.txt
+++ b/libc/test/src/fenv/CMakeLists.txt
@@ -9,6 +9,8 @@ add_libc_unittest(
   DEPENDS
     libc.src.fenv.fegetround
     libc.src.fenv.fesetround
+  LINK_LIBRARIES
+    LibcFPTestHelpers
 )
 
 add_libc_unittest(
@@ -23,6 +25,8 @@ add_libc_unittest(
     libc.src.fenv.fesetexcept
     libc.src.fenv.fetestexcept
     libc.src.__support.FPUtil.fenv_impl
+  LINK_LIBRARIES
+    LibcFPTestHelpers
 )
 
 add_libc_unittest(
@@ -37,6 +41,8 @@ add_libc_unittest(
     libc.src.fenv.fesetenv
     libc.src.fenv.fesetround
     libc.src.__support.FPUtil.fenv_impl
+  LINK_LIBRARIES
+    LibcFPTestHelpers
 )
 
 add_libc_unittest(
@@ -50,6 +56,8 @@ add_libc_unittest(
     libc.src.fenv.fesetexceptflag
     libc.src.fenv.fetestexceptflag
     libc.src.__support.FPUtil.fenv_impl
+  LINK_LIBRARIES
+    LibcFPTestHelpers
 )
 
 add_libc_unittest(
@@ -62,6 +70,8 @@ add_libc_unittest(
     libc.include.signal
     libc.src.fenv.feupdateenv
     libc.src.__support.FPUtil.fenv_impl
+  LINK_LIBRARIES
+    LibcFPTestHelpers
 )
 
 add_libc_unittest(
@@ -73,6 +83,8 @@ add_libc_unittest(
   DEPENDS
     libc.src.fenv.feclearexcept
     libc.src.__support.FPUtil.fenv_impl
+  LINK_LIBRARIES
+    LibcFPTestHelpers
 )
 
 add_libc_unittest(
@@ -85,6 +97,8 @@ add_libc_unittest(
     libc.src.fenv.fedisableexcept
     libc.src.fenv.feenableexcept
     libc.src.fenv.fegetexcept
+  LINK_LIBRARIES
+    LibcFPTestHelpers
 )
 
 if (NOT (LLVM_USE_SANITIZER OR (${LIBC_TARGET_OS} STREQUAL "windows")
@@ -109,6 +123,7 @@ if (NOT (LLVM_USE_SANITIZER OR (${LIBC_TARGET_OS} STREQUAL "windows")
       libc.src.__support.FPUtil.fenv_impl
     LINK_LIBRARIES
       LibcFPExceptionHelpers
+      LibcFPTestHelpers
   )
 
   add_fp_unittest(
@@ -124,5 +139,6 @@ if (NOT (LLVM_USE_SANITIZER OR (${LIBC_TARGET_OS} STREQUAL "windows")
       libc.src.__support.FPUtil.fenv_impl
     LINK_LIBRARIES
       LibcFPExceptionHelpers
+      LibcFPTestHelpers
   )
 endif()
diff --git a/libc/test/src/fenv/enabled_exceptions_test.cpp b/libc/test/src/fenv/enabled_exceptions_test.cpp
index 53440b704ca761..0b0c2b369d476e 100644
--- a/libc/test/src/fenv/enabled_exceptions_test.cpp
+++ b/libc/test/src/fenv/enabled_exceptions_test.cpp
@@ -13,16 +13,20 @@
 #include "src/__support/FPUtil/FEnvImpl.h"
 #include "src/__support/macros/properties/architectures.h"
 #include "test/UnitTest/FPExceptMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 #include "hdr/fenv_macros.h"
 #include <signal.h>
 
+#include "excepts.h"
+
+using LlvmLibcExceptionStatusTest = LIBC_NAMESPACE::testing::FEnvSafeTest;
+
 // This test enables an exception and verifies that raising that exception
 // triggers SIGFPE.
-TEST(LlvmLibcExceptionStatusTest, RaiseAndCrash) {
-#if defined(LIBC_TARGET_ARCH_IS_ANY_ARM) ||                                    \
-    defined(LIBC_TARGET_ARCH_IS_ANY_RISCV)
+TEST_F(LlvmLibcExceptionStatusTest, RaiseAndCrash) {
+#if defined(LIBC_TARGET_ARCH_IS_ANY_ARM) || defined(LIBC_TARGET_ARCH_IS_ANY_RISCV)
   // Few Arm HW implementations do not trap exceptions. We skip this test
   // completely on such HW.
   //
@@ -34,23 +38,14 @@ TEST(LlvmLibcExceptionStatusTest, RaiseAndCrash) {
   LIBC_NAMESPACE::fputil::enable_except(FE_DIVBYZERO);
   if (LIBC_NAMESPACE::fputil::get_except() == 0)
     return;
-#endif // Architectures where exception trapping is not supported
+#endif  // Architectures where exception trapping is not supported
 
   // TODO: Install a floating point exception handler and verify that the
   // the expected exception was raised. One will have to longjmp back from
   // that exception handler, so such a testing can be done after we have
   // longjmp implemented.
 
-  int excepts[] = {FE_DIVBYZERO, FE_INVALID, FE_INEXACT, FE_OVERFLOW,
-                   FE_UNDERFLOW};
-
-  // We '|' the individual exception flags instead of using FE_ALL_EXCEPT
-  // as it can include non-standard extensions. Note that we should be able
-  // to compile this file with headers from other libcs as well.
-  constexpr int ALL_EXCEPTS =
-      FE_DIVBYZERO | FE_INVALID | FE_INEXACT | FE_OVERFLOW | FE_UNDERFLOW;
-
-  for (int e : excepts) {
+  for (int e : EXCEPTS) {
     LIBC_NAMESPACE::fputil::disable_except(FE_ALL_EXCEPT);
     LIBC_NAMESPACE::fputil::enable_except(e);
     ASSERT_EQ(LIBC_NAMESPACE::feclearexcept(FE_ALL_EXCEPT), 0);
diff --git a/libc/test/src/fenv/exception_flags_test.cpp b/libc/test/src/fenv/exception_flags_test.cpp
index 9d2be6426a6d0b..2f4332df861fec 100644
--- a/libc/test/src/fenv/exception_flags_test.cpp
+++ b/libc/test/src/fenv/exception_flags_test.cpp
@@ -12,18 +12,20 @@
 #include "src/fenv/fetestexceptflag.h"
 
 #include "src/__support/FPUtil/FEnvImpl.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
-TEST(LlvmLibcFenvTest, GetSetTestExceptFlag) {
+#include "excepts.h"
+
+using LlvmLibcFEnvTest = LIBC_NAMESPACE::testing::FEnvSafeTest;
+
+TEST_F(LlvmLibcFEnvTest, GetSetTestExceptFlag) {
   // We will disable all exceptions to prevent invocation of the exception
   // handler.
   LIBC_NAMESPACE::fputil::disable_except(FE_ALL_EXCEPT);
   LIBC_NAMESPACE::fputil::clear_except(FE_ALL_EXCEPT);
 
-  int excepts[] = {FE_DIVBYZERO, FE_INVALID, FE_INEXACT, FE_OVERFLOW,
-                   FE_UNDERFLOW};
-
-  for (int e : excepts) {
+  for (int e : EXCEPTS) {
     // The overall idea is to raise an except and save the exception flags.
     // Next, clear the flags and then set the saved exception flags. This
     // should set the flag corresponding to the previously raised exception.
diff --git a/libc/test/src/fenv/exception_status_test.cpp b/libc/test/src/fenv/exception_status_test.cpp
index a7000020b1a3c8..fdf9421457866e 100644
--- a/libc/test/src/fenv/exception_status_test.cpp
+++ b/libc/test/src/fenv/exception_status_test.cpp
@@ -13,24 +13,23 @@
 #include "src/fenv/fetestexcept.h"
 
 #include "src/__support/FPUtil/FEnvImpl.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 #include "hdr/fenv_macros.h"
 
-TEST(LlvmLibcExceptionStatusTest, RaiseAndTest) {
+#include "excepts.h"
+
+using LlvmLibcExceptionStatusTest = LIBC_NAMESPACE::testing::FEnvSafeTest;
+
+TEST_F(LlvmLibcExceptionStatusTest, RaiseAndTest) {
   // This test raises a set of exceptions and checks that the exception
   // status flags are updated. The intention is really not to invoke the
   // exception handler. Hence, we will disable all exceptions at the
   // beginning.
   LIBC_NAMESPACE::fputil::disable_except(FE_ALL_EXCEPT);
 
-  int excepts[] = {FE_DIVBYZERO, FE_INVALID, FE_INEXACT, FE_OVERFLOW,
-                   FE_UNDERFLOW};
-
-  constexpr int ALL_EXCEPTS =
-      FE_DIVBYZERO | FE_INVALID | FE_INEXACT | FE_OVERFLOW | FE_UNDERFLOW;
-
-  for (int e : excepts) {
+  for (int e : EXCEPTS) {
     int r = LIBC_NAMESPACE::feraiseexcept(e);
     ASSERT_EQ(r, 0);
     int s = LIBC_NAMESPACE::fetestexcept(e);
@@ -47,8 +46,8 @@ TEST(LlvmLibcExceptionStatusTest, RaiseAndTest) {
     ASSERT_EQ(s, e);
   }
 
-  for (int e1 : excepts) {
-    for (int e2 : excepts) {
+  for (int e1 : EXCEPTS) {
+    for (int e2 : EXCEPTS) {
       int e = e1 | e2;
       int r = LIBC_NAMESPACE::feraiseexcept(e);
       ASSERT_EQ(r, 0);
@@ -67,9 +66,9 @@ TEST(LlvmLibcExceptionStatusTest, RaiseAndTest) {
     }
   }
 
-  for (int e1 : excepts) {
-    for (int e2 : excepts) {
-      for (int e3 : excepts) {
+  for (int e1 : EXCEPTS) {
+    for (int e2 : EXCEPTS) {
+      for (int e3 : EXCEPTS) {
         int e = e1 | e2 | e3;
         int r = LIBC_NAMESPACE::feraiseexcept(e);
         ASSERT_EQ(r, 0);
@@ -89,10 +88,10 @@ TEST(LlvmLibcExceptionStatusTest, RaiseAndTest) {
     }
   }
 
-  for (int e1 : excepts) {
-    for (int e2 : excepts) {
-      for (int e3 : excepts) {
-        for (int e4 : excepts) {
+  for (int e1 : EXCEPTS) {
+    for (int e2 : EXCEPTS) {
+      for (int e3 : EXCEPTS) {
+        for (int e4 : EXCEPTS) {
           int e = e1 | e2 | e3 | e4;
           int r = LIBC_NAMESPACE::feraiseexcept(e);
           ASSERT_EQ(r, 0);
@@ -113,11 +112,11 @@ TEST(LlvmLibcExceptionStatusTest, RaiseAndTest) {
     }
   }
 
-  for (int e1 : excepts) {
-    for (int e2 : excepts) {
-      for (int e3 : excepts) {
-        for (int e4 : excepts) {
-          for (int e5 : excepts) {
+  for (int e1 : EXCEPTS) {
+    for (int e2 : EXCEPTS) {
+      for (int e3 : EXCEPTS) {
+        for (int e4 : EXCEPTS) {
+          for (int e5 : EXCEPTS) {
             int e = e1 | e2 | e3 | e4 | e5;
             int r = LIBC_NAMESPACE::feraiseexcept(e);
             ASSERT_EQ(r, 0);
diff --git a/libc/test/src/fenv/excepts.h b/libc/test/src/fenv/excepts.h
new file mode 100644
index 00000000000000..e9517d319a9b79
--- /dev/null
+++ b/libc/test/src/fenv/excepts.h
@@ -0,0 +1,24 @@
+//===-- List of all FE_* constants for tests -----------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===---------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TEST_SRC_FENV_EXCEPTS_H
+#define LLVM_LIBC_TEST_SRC_FENV_EXCEPTS_H
+
+#include "hdr/fenv_macros.h"
+
+constexpr int EXCEPTS[] = {
+    FE_DIVBYZERO, FE_INVALID, FE_INEXACT, FE_OVERFLOW, FE_UNDERFLOW,
+};
+
+// We '|' the individual exception flags instead of using FE_ALL_EXCEPT
+// as it can include non-standard extensions. Note that we should be able
+// to compile this file with headers from other libcs as well.
+constexpr int ALL_EXCEPTS =
+    FE_DIVBYZERO | FE_INVALID | FE_INEXACT | FE_OVERFLOW | FE_UNDERFLOW;
+
+#endif // LLVM_LIBC_TEST_SRC_FENV_EXCEPTS_H
diff --git a/libc/test/src/fenv/feclearexcept_test.cpp b/libc/test/src/fenv/feclearexcept_test.cpp
index bb42d9070358ef..52adda46adf2f0 100644
--- a/libc/test/src/fenv/feclearexcept_test.cpp
+++ b/libc/test/src/fenv/feclearexcept_test.cpp
@@ -9,27 +9,30 @@
 #include "src/fenv/feclearexcept.h"
 
 #include "src/__support/FPUtil/FEnvImpl.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 #include "hdr/fenv_macros.h"
 #include <stdint.h>
 
-TEST(LlvmLibcFEnvTest, ClearTest) {
-  uint16_t excepts[] = {FE_DIVBYZERO, FE_INVALID, FE_INEXACT, FE_OVERFLOW,
-                        FE_UNDERFLOW};
+#include "excepts.h"
+
+using LlvmLibcFEnvTest = LIBC_NAMESPACE::testing::FEnvSafeTest;
+
+TEST_F(LlvmLibcFEnvTest, ClearTest) {
   LIBC_NAMESPACE::fputil::disable_except(FE_ALL_EXCEPT);
   LIBC_NAMESPACE::fputil::clear_except(FE_ALL_EXCEPT);
 
-  for (uint16_t e : excepts)
+  for (int e : EXCEPTS)
     ASSERT_EQ(LIBC_NAMESPACE::fputil::test_except(e), 0);
 
   LIBC_NAMESPACE::fputil::raise_except(FE_ALL_EXCEPT);
 
-  for (uint16_t e1 : excepts) {
-    for (uint16_t e2 : excepts) {
-      for (uint16_t e3 : excepts) {
-        for (uint16_t e4 : excepts) {
-          for (uint16_t e5 : excepts) {
+  for (int e1 : EXCEPTS) {
+    for (int e2 : EXCEPTS) {
+      for (int e3 : EXCEPTS) {
+        for (int e4 : EXCEPTS) {
+          for (int e5 : EXCEPTS) {
             // We clear one exception and test to verify that it was cleared.
             LIBC_NAMESPACE::feclearexcept(e1 | e2 | e3 | e4 | e5);
             ASSERT_EQ(
diff --git a/libc/test/src/fenv/feenableexcept_test.cpp b/libc/test/src/fenv/feenableexcept_test.cpp
index aeb4f955fd69b6..232e2a1c8316c6 100644
--- a/libc/test/src/fenv/feenableexcept_test.cpp
+++ b/libc/test/src/fenv/feenableexcept_test.cpp
@@ -11,11 +11,16 @@
 #include "src/fenv/feenableexcept.h"
 #include "src/fenv/fegetexcept.h"
 
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 #include "hdr/fenv_macros.h"
 
-TEST(LlvmLibcFEnvTest, EnableTest) {
+#include "excepts.h"
+
+using LlvmLibcFEnvTest = LIBC_NAMESPACE::testing::FEnvSafeTest;
+
+TEST_F(LlvmLibcFEnvTest, EnableTest) {
 #if defined(LIBC_TARGET_ARCH_IS_ANY_ARM) ||                                    \
     defined(LIBC_TARGET_ARCH_IS_ANY_RISCV)
   // Few Arm HW implementations do not trap exceptions. We skip this test
diff --git a/libc/test/src/fenv/feholdexcept_test.cpp b/libc/test/src/fenv/feholdexcept_test.cpp
index 0689d89ab233a3..b4e8201d6afb39 100644
--- a/libc/test/src/fenv/feholdexcept_test.cpp
+++ b/libc/test/src/fenv/feholdexcept_test.cpp
@@ -12,9 +12,14 @@
 #include "src/__support/FPUtil/FEnvImpl.h"
 #include "src/__support/macros/properties/architectures.h"
 #include "test/UnitTest/FPExceptMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
-TEST(LlvmLibcFEnvTest, RaiseAndCrash) {
+#include "excepts.h"
+
+using LlvmLibcFEnvTest = LIBC_NAMESPACE::testing::FEnvSafeTest;
+
+TEST_F(LlvmLibcFEnvTest, RaiseAndCrash) {
 #if defined(LIBC_TARGET_ARCH_IS_ANY_ARM) ||                                    \
     defined(LIBC_TARGET_ARCH_IS_ANY_RISCV)
   // Few Arm HW implementations do not trap exceptions. We skip this test
diff --git a/libc/test/src/fenv/feupdateenv_test.cpp b/libc/test/src/fenv/feupdateenv_test.cpp
index 251b8566aac3d6..d2ffc0ef8e84d3 100644
--- a/libc/test/src/fenv/feupdateenv_test.cpp
+++ b/libc/test/src/fenv/feupdateenv_test.cpp
@@ -10,11 +10,12 @@
 #include "src/fenv/feupdateenv.h"
 
 #include "src/__support/FPUtil/FEnvImpl.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
-#include <signal.h>
+using LlvmLibcFEnvTest = LIBC_NAMESPACE::testing::FEnvSafeTest;
 
-TEST(LlvmLibcFEnvTest, UpdateEnvTest) {
+TEST_F(LlvmLibcFEnvTest, UpdateEnvTest) {
   LIBC_NAMESPACE::fputil::disable_except(FE_ALL_EXCEPT);
   LIBC_NAMESPACE::fputil::clear_except(FE_ALL_EXCEPT);
 
diff --git a/libc/test/src/fenv/getenv_and_setenv_test.cpp b/libc/test/src/fenv/getenv_and_setenv_test.cpp
index f767e8ab9b2fb8..7257e75cb421ae 100644
--- a/libc/test/src/fenv/getenv_and_setenv_test.cpp
+++ b/libc/test/src/fenv/getenv_and_setenv_test.cpp
@@ -13,17 +13,19 @@
 #include "src/fenv/fesetround.h"
 
 #include "src/__support/FPUtil/FEnvImpl.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
-TEST(LlvmLibcFenvTest, GetEnvAndSetEnv) {
+#include "excepts.h"
+
+using LlvmLibcFEnvTest = LIBC_NAMESPACE::testing::FEnvSafeTest;
+
+TEST_F(LlvmLibcFEnvTest, GetEnvAndSetEnv) {
   // We will disable all exceptions to prevent invocation of the exception
   // handler.
   LIBC_NAMESPACE::fputil::disable_except(FE_ALL_EXCEPT);
 
-  int excepts[] = {FE_DIVBYZERO, FE_INVALID, FE_INEXACT, FE_OVERFLOW,
-                   FE_UNDERFLOW};
-
-  for (int e : excepts) {
+  for (int e : EXCEPTS) {
     LIBC_NAMESPACE::fputil::clear_except(FE_ALL_EXCEPT);
 
     // Save the cleared environment.
@@ -71,7 +73,7 @@ TEST(LlvmLibcFenvTest, Set_FE_DFL_ENV) {
 }
 
 #ifdef _WIN32
-TEST(LlvmLibcFenvTest, Windows_Set_Get_Test) {
+TEST_F(LlvmLibcFEnvTest, Windows_Set_Get_Test) {
   // If a valid fenv_t is written, then reading it back out should be identical.
   fenv_t setEnv = {0x7e00053e, 0x0f00000f};
   fenv_t getEnv;
diff --git a/libc/test/src/fenv/rounding_mode_test.cpp b/libc/test/src/fenv/rounding_mode_test.cpp
index ec2e27ecc818b2..f242ed9aaffe5b 100644
--- a/libc/test/src/fenv/rounding_mode_test.cpp
+++ b/libc/test/src/fenv/rounding_mode_test.cpp
@@ -9,15 +9,18 @@
 #include "src/fenv/fegetround.h"
 #include "src/fenv/fesetround.h"
 
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 #include "hdr/fenv_macros.h"
 
-TEST(LlvmLibcRoundingModeTest, SetAndGet) {
+using LlvmLibcRoundingModeTest = LIBC_NAMESPACE::testing::FEnvSafeTest;
+
+TEST_F(LlvmLibcRoundingModeTest, SetAndGet) {
   struct ResetDefaultRoundingMode {
-    int original;
+    int original = LIBC_NAMESPACE::fegetround();
     ~ResetDefaultRoundingMode() { LIBC_NAMESPACE::fesetround(original); }
-  } reset{LIBC_NAMESPACE::fegetround()};
+  } reset;
 
   int s = LIBC_NAMESPACE::fesetround(FE_TONEAREST);
   EXPECT_EQ(s, 0);
diff --git a/libc/test/src/math/CeilTest.h b/libc/test/src/math/CeilTest.h
index da3f3c0e8f5abd..5cb7c078fa0a8f 100644
--- a/libc/test/src/math/CeilTest.h
+++ b/libc/test/src/math/CeilTest.h
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 #include "utils/MPFRWrapper/MPFRUtils.h"
 
@@ -14,7 +15,7 @@
 
 namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
 
-template <typename T> class CeilTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T> class CeilTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 
diff --git a/libc/test/src/math/CopySignTest.h b/libc/test/src/math/CopySignTest.h
index 052ff0333438e9..9e885d2db94930 100644
--- a/libc/test/src/math/CopySignTest.h
+++ b/libc/test/src/math/CopySignTest.h
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 #include "utils/MPFRWrapper/MPFRUtils.h"
 
@@ -15,7 +16,7 @@
 namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
 
 template <typename T>
-class CopySignTest : public LIBC_NAMESPACE::testing::Test {
+class CopySignTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 
diff --git a/libc/test/src/math/FAbsTest.h b/libc/test/src/math/FAbsTest.h
index 23ad8a26c481c2..7cfcac100cd1ef 100644
--- a/libc/test/src/math/FAbsTest.h
+++ b/libc/test/src/math/FAbsTest.h
@@ -10,6 +10,7 @@
 #define LLVM_LIBC_TEST_SRC_MATH_FABSTEST_H
 
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 #include "utils/MPFRWrapper/MPFRUtils.h"
 
@@ -17,7 +18,7 @@
 
 namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
 
-template <typename T> class FAbsTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T> class FAbsTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 
diff --git a/libc/test/src/math/FDimTest.h b/libc/test/src/math/FDimTest.h
index 44aba9caf6463e..e006bfcad6faa5 100644
--- a/libc/test/src/math/FDimTest.h
+++ b/libc/test/src/math/FDimTest.h
@@ -10,10 +10,11 @@
 #include "src/__support/FPUtil/BasicOperations.h"
 #include "src/__support/FPUtil/FPBits.h"
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 template <typename T>
-class FDimTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class FDimTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 public:
   using FuncPtr = T (*)(T, T);
   using FPBits = LIBC_NAMESPACE::fputil::FPBits<T>;
diff --git a/libc/test/src/math/FMaxTest.h b/libc/test/src/math/FMaxTest.h
index e9857f332e6518..c4f42e3b965fbf 100644
--- a/libc/test/src/math/FMaxTest.h
+++ b/libc/test/src/math/FMaxTest.h
@@ -10,6 +10,7 @@
 #define LLVM_LIBC_TEST_SRC_MATH_FMAXTEST_H
 
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 #include "utils/MPFRWrapper/MPFRUtils.h"
 
@@ -17,7 +18,7 @@
 
 namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
 
-template <typename T> class FMaxTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T> class FMaxTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 
diff --git a/libc/test/src/math/FMinTest.h b/libc/test/src/math/FMinTest.h
index c6b9f4439b79b7..a05f1b6cad1c52 100644
--- a/libc/test/src/math/FMinTest.h
+++ b/libc/test/src/math/FMinTest.h
@@ -10,6 +10,7 @@
 #define LLVM_LIBC_TEST_SRC_MATH_FMINTEST_H
 
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 #include "utils/MPFRWrapper/MPFRUtils.h"
 
@@ -17,7 +18,7 @@
 
 namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
 
-template <typename T> class FMinTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T> class FMinTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 
diff --git a/libc/test/src/math/FModTest.h b/libc/test/src/math/FModTest.h
index bc909987a161b8..da5f502151cb34 100644
--- a/libc/test/src/math/FModTest.h
+++ b/libc/test/src/math/FModTest.h
@@ -12,6 +12,7 @@
 #include "src/__support/FPUtil/BasicOperations.h"
 #include "src/__support/FPUtil/NearestIntegerOperations.h"
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 #include "hdr/math_macros.h"
@@ -24,7 +25,7 @@
 
 #define TEST_REGULAR(x, y, expected) TEST_SPECIAL(x, y, expected, false, 0)
 
-template <typename T> class FmodTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T> class FmodTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 
diff --git a/libc/test/src/math/FloorTest.h b/libc/test/src/math/FloorTest.h
index 679dc26e124806..892c819cb8861a 100644
--- a/libc/test/src/math/FloorTest.h
+++ b/libc/test/src/math/FloorTest.h
@@ -10,6 +10,7 @@
 #define LLVM_LIBC_TEST_SRC_MATH_FLOORTEST_H
 
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 #include "utils/MPFRWrapper/MPFRUtils.h"
 
@@ -17,7 +18,7 @@
 
 namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
 
-template <typename T> class FloorTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T> class FloorTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 
diff --git a/libc/test/src/math/FmaTest.h b/libc/test/src/math/FmaTest.h
index 76bd221fcb1f2f..5f315c53c2624a 100644
--- a/libc/test/src/math/FmaTest.h
+++ b/libc/test/src/math/FmaTest.h
@@ -13,13 +13,14 @@
 #include "src/stdlib/rand.h"
 #include "src/stdlib/srand.h"
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 #include "utils/MPFRWrapper/MPFRUtils.h"
 
 namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
 
 template <typename T>
-class FmaTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class FmaTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 private:
   using Func = T (*)(T, T, T);
   using FPBits = LIBC_NAMESPACE::fputil::FPBits<T>;
diff --git a/libc/test/src/math/FrexpTest.h b/libc/test/src/math/FrexpTest.h
index 5f993f604999d8..2bd8bd17e9a11c 100644
--- a/libc/test/src/math/FrexpTest.h
+++ b/libc/test/src/math/FrexpTest.h
@@ -8,6 +8,7 @@
 
 #include "src/__support/FPUtil/BasicOperations.h"
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 #include "utils/MPFRWrapper/MPFRUtils.h"
 
@@ -15,7 +16,7 @@
 
 namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
 
-template <typename T> class FrexpTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T> class FrexpTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 
diff --git a/libc/test/src/math/HypotTest.h b/libc/test/src/math/HypotTest.h
index 0c15f02fe37193..c86f1ffda577a9 100644
--- a/libc/test/src/math/HypotTest.h
+++ b/libc/test/src/math/HypotTest.h
@@ -11,6 +11,7 @@
 
 #include "src/__support/FPUtil/FPBits.h"
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 #include "utils/MPFRWrapper/MPFRUtils.h"
 
@@ -19,7 +20,7 @@
 namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
 
 template <typename T>
-class HypotTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class HypotTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 private:
   using Func = T (*)(T, T);
   using FPBits = LIBC_NAMESPACE::fputil::FPBits<T>;
diff --git a/libc/test/src/math/ILogbTest.h b/libc/test/src/math/ILogbTest.h
index 3d1f047a480613..c2d5a1326e0ed2 100644
--- a/libc/test/src/math/ILogbTest.h
+++ b/libc/test/src/math/ILogbTest.h
@@ -13,9 +13,10 @@
 #include "src/__support/CPP/limits.h" // INT_MAX
 #include "src/__support/FPUtil/FPBits.h"
 #include "src/__support/FPUtil/ManipulationFunctions.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
-class LlvmLibcILogbTest : public LIBC_NAMESPACE::testing::Test {
+class LlvmLibcILogbTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 public:
   template <typename T> struct ILogbFunc {
     typedef int (*Func)(T);
diff --git a/libc/test/src/math/LdExpTest.h b/libc/test/src/math/LdExpTest.h
index 2a406feed52fc1..68515e683f0878 100644
--- a/libc/test/src/math/LdExpTest.h
+++ b/libc/test/src/math/LdExpTest.h
@@ -13,13 +13,14 @@
 #include "src/__support/FPUtil/FPBits.h"
 #include "src/__support/FPUtil/NormalFloat.h"
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 #include "hdr/math_macros.h"
 #include <stdint.h>
 
 template <typename T>
-class LdExpTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class LdExpTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
   using FPBits = LIBC_NAMESPACE::fputil::FPBits<T>;
   using NormalFloat = LIBC_NAMESPACE::fputil::NormalFloat<T>;
   using StorageType = typename FPBits::StorageType;
diff --git a/libc/test/src/math/LogbTest.h b/libc/test/src/math/LogbTest.h
index f066d5f9de02b1..cdcbeb084d1cd9 100644
--- a/libc/test/src/math/LogbTest.h
+++ b/libc/test/src/math/LogbTest.h
@@ -8,6 +8,7 @@
 
 #include "src/__support/FPUtil/ManipulationFunctions.h"
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 #include "utils/MPFRWrapper/MPFRUtils.h"
 
@@ -15,7 +16,7 @@
 
 namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
 
-template <typename T> class LogbTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T> class LogbTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 
diff --git a/libc/test/src/math/ModfTest.h b/libc/test/src/math/ModfTest.h
index 49b0328753b3bc..1d5228f8326589 100644
--- a/libc/test/src/math/ModfTest.h
+++ b/libc/test/src/math/ModfTest.h
@@ -9,6 +9,7 @@
 #include "src/__support/FPUtil/BasicOperations.h"
 #include "src/__support/FPUtil/NearestIntegerOperations.h"
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 #include "utils/MPFRWrapper/MPFRUtils.h"
 
@@ -16,7 +17,7 @@
 
 namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
 
-template <typename T> class ModfTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T> class ModfTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 
diff --git a/libc/test/src/math/NextAfterTest.h b/libc/test/src/math/NextAfterTest.h
index a7248dd7042d46..2aac69d3f70246 100644
--- a/libc/test/src/math/NextAfterTest.h
+++ b/libc/test/src/math/NextAfterTest.h
@@ -15,10 +15,11 @@
 #include "src/__support/FPUtil/BasicOperations.h"
 #include "src/__support/FPUtil/FPBits.h"
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 template <typename T>
-class NextAfterTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class NextAfterTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
   using FPBits = LIBC_NAMESPACE::fputil::FPBits<T>;
   using StorageType = typename FPBits::StorageType;
 
diff --git a/libc/test/src/math/RIntTest.h b/libc/test/src/math/RIntTest.h
index c706ff18f186e5..4431f0da6ad6b5 100644
--- a/libc/test/src/math/RIntTest.h
+++ b/libc/test/src/math/RIntTest.h
@@ -12,6 +12,7 @@
 #include "src/__support/FPUtil/FEnvImpl.h"
 #include "src/__support/FPUtil/FPBits.h"
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 #include "utils/MPFRWrapper/MPFRUtils.h"
 
@@ -25,7 +26,7 @@ static constexpr int ROUNDING_MODES[4] = {FE_UPWARD, FE_DOWNWARD, FE_TOWARDZERO,
                                           FE_TONEAREST};
 
 template <typename T>
-class RIntTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class RIntTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 public:
   typedef T (*RIntFunc)(T);
 
diff --git a/libc/test/src/math/RemQuoTest.h b/libc/test/src/math/RemQuoTest.h
index 677772dd9fccfd..339faf50798e3d 100644
--- a/libc/test/src/math/RemQuoTest.h
+++ b/libc/test/src/math/RemQuoTest.h
@@ -13,13 +13,14 @@
 #include "src/__support/FPUtil/BasicOperations.h"
 #include "src/__support/FPUtil/FPBits.h"
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 #include "utils/MPFRWrapper/MPFRUtils.h"
 
 namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
 
 template <typename T>
-class RemQuoTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class RemQuoTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
   using FPBits = LIBC_NAMESPACE::fputil::FPBits<T>;
   using StorageType = typename FPBits::StorageType;
 
diff --git a/libc/test/src/math/RoundEvenTest.h b/libc/test/src/math/RoundEvenTest.h
index 68b8b9ae1d964b..560c4b27a5e196 100644
--- a/libc/test/src/math/RoundEvenTest.h
+++ b/libc/test/src/math/RoundEvenTest.h
@@ -10,6 +10,7 @@
 #define LLVM_LIBC_TEST_SRC_MATH_ROUNDEVENTEST_H
 
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 #include "utils/MPFRWrapper/MPFRUtils.h"
 
@@ -18,7 +19,7 @@
 namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
 
 template <typename T>
-class RoundEvenTest : public LIBC_NAMESPACE::testing::Test {
+class RoundEvenTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 
diff --git a/libc/test/src/math/RoundTest.h b/libc/test/src/math/RoundTest.h
index eecf95982729be..0a7f57b8be85ec 100644
--- a/libc/test/src/math/RoundTest.h
+++ b/libc/test/src/math/RoundTest.h
@@ -10,6 +10,7 @@
 #define LLVM_LIBC_TEST_SRC_MATH_ROUNDTEST_H
 
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 #include "utils/MPFRWrapper/MPFRUtils.h"
 
@@ -17,7 +18,7 @@
 
 namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
 
-template <typename T> class RoundTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T> class RoundTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 
diff --git a/libc/test/src/math/RoundToIntegerTest.h b/libc/test/src/math/RoundToIntegerTest.h
index 7c93451235f296..3444d2039c31f1 100644
--- a/libc/test/src/math/RoundToIntegerTest.h
+++ b/libc/test/src/math/RoundToIntegerTest.h
@@ -12,6 +12,7 @@
 #include "src/__support/FPUtil/FEnvImpl.h"
 #include "src/__support/FPUtil/FPBits.h"
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 #include "utils/MPFRWrapper/MPFRUtils.h"
 
@@ -24,7 +25,7 @@ static constexpr int ROUNDING_MODES[4] = {FE_UPWARD, FE_DOWNWARD, FE_TOWARDZERO,
                                           FE_TONEAREST};
 
 template <typename F, typename I, bool TestModes = false>
-class RoundToIntegerTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class RoundToIntegerTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 public:
   typedef I (*RoundToIntegerFunc)(F);
 
@@ -81,6 +82,8 @@ class RoundToIntegerTestTemplate : public LIBC_NAMESPACE::testing::Test {
 
 public:
   void SetUp() override {
+    LIBC_NAMESPACE::testing::FEnvSafeTest::SetUp();
+
     if (math_errhandling & MATH_ERREXCEPT) {
       // We will disable all exceptions so that the test will not
       // crash with SIGFPE. We can still use fetestexcept to check
diff --git a/libc/test/src/math/SqrtTest.h b/libc/test/src/math/SqrtTest.h
index 799b7862a37260..9f9dd0899be838 100644
--- a/libc/test/src/math/SqrtTest.h
+++ b/libc/test/src/math/SqrtTest.h
@@ -8,6 +8,7 @@
 
 #include "src/__support/CPP/bit.h"
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 #include "utils/MPFRWrapper/MPFRUtils.h"
 
@@ -15,7 +16,7 @@
 
 namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
 
-template <typename T> class SqrtTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T> class SqrtTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 
diff --git a/libc/test/src/math/TruncTest.h b/libc/test/src/math/TruncTest.h
index 57c953fad8742f..a3556968f2b9e2 100644
--- a/libc/test/src/math/TruncTest.h
+++ b/libc/test/src/math/TruncTest.h
@@ -10,6 +10,7 @@
 #define LLVM_LIBC_TEST_SRC_MATH_TRUNCTEST_H
 
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 #include "utils/MPFRWrapper/MPFRUtils.h"
 
@@ -17,7 +18,7 @@
 
 namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
 
-template <typename T> class TruncTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T> class TruncTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 
diff --git a/libc/test/src/math/exhaustive/fmod_generic_impl_test.cpp b/libc/test/src/math/exhaustive/fmod_generic_impl_test.cpp
index c7aec5b7bc21b4..762a3376ffbb50 100644
--- a/libc/test/src/math/exhaustive/fmod_generic_impl_test.cpp
+++ b/libc/test/src/math/exhaustive/fmod_generic_impl_test.cpp
@@ -10,6 +10,7 @@
 #include "src/__support/FPUtil/ManipulationFunctions.h" // ldexp
 #include "src/__support/FPUtil/generic/FMod.h"
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 #include "utils/MPFRWrapper/MPFRUtils.h"
 
@@ -18,7 +19,7 @@
 namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
 
 template <typename T, bool InverseMultiplication>
-class LlvmLibcFModTest : public LIBC_NAMESPACE::testing::Test {
+class LlvmLibcFModTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   using FPBits = LIBC_NAMESPACE::fputil::FPBits<T>;
   using U = typename FPBits::StorageType;
diff --git a/libc/test/src/math/smoke/CanonicalizeTest.h b/libc/test/src/math/smoke/CanonicalizeTest.h
index ab45e0eb8e94d3..5e40ab6e4db4f0 100644
--- a/libc/test/src/math/smoke/CanonicalizeTest.h
+++ b/libc/test/src/math/smoke/CanonicalizeTest.h
@@ -12,6 +12,7 @@
 #include "src/__support/FPUtil/FPBits.h"
 #include "src/__support/integer_literals.h"
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 #include "hdr/math_macros.h"
@@ -26,7 +27,7 @@
 using LIBC_NAMESPACE::operator""_u128;
 
 template <typename T>
-class CanonicalizeTest : public LIBC_NAMESPACE::testing::Test {
+class CanonicalizeTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 
diff --git a/libc/test/src/math/smoke/CeilTest.h b/libc/test/src/math/smoke/CeilTest.h
index 70e441a849cb4f..dbb99d670b463e 100644
--- a/libc/test/src/math/smoke/CeilTest.h
+++ b/libc/test/src/math/smoke/CeilTest.h
@@ -10,11 +10,12 @@
 #define LLVM_LIBC_TEST_SRC_MATH_SMOKE_CEILTEST_H
 
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 #include "hdr/math_macros.h"
 
-template <typename T> class CeilTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T> class CeilTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 
diff --git a/libc/test/src/math/smoke/CopySignTest.h b/libc/test/src/math/smoke/CopySignTest.h
index fa9da91920f8de..0099b88c36d2b2 100644
--- a/libc/test/src/math/smoke/CopySignTest.h
+++ b/libc/test/src/math/smoke/CopySignTest.h
@@ -10,12 +10,13 @@
 #define LLVM_LIBC_TEST_SRC_MATH_SMOKE_COPYSIGNTEST_H
 
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 #include "hdr/math_macros.h"
 
 template <typename T>
-class CopySignTest : public LIBC_NAMESPACE::testing::Test {
+class CopySignTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 
diff --git a/libc/test/src/math/smoke/FAbsTest.h b/libc/test/src/math/smoke/FAbsTest.h
index 0c8ca95ba0f7bc..9679d4b29890c2 100644
--- a/libc/test/src/math/smoke/FAbsTest.h
+++ b/libc/test/src/math/smoke/FAbsTest.h
@@ -10,11 +10,12 @@
 #define LLVM_LIBC_TEST_SRC_MATH_SMOKE_FABSTEST_H
 
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 #include "hdr/math_macros.h"
 
-template <typename T> class FAbsTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T> class FAbsTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 
diff --git a/libc/test/src/math/smoke/FDimTest.h b/libc/test/src/math/smoke/FDimTest.h
index e557b40d90efa1..597c9f1be7938b 100644
--- a/libc/test/src/math/smoke/FDimTest.h
+++ b/libc/test/src/math/smoke/FDimTest.h
@@ -9,10 +9,11 @@
 #include "src/__support/FPUtil/BasicOperations.h"
 #include "src/__support/FPUtil/FPBits.h"
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 template <typename T>
-class FDimTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class FDimTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 public:
   using FuncPtr = T (*)(T, T);
   using FPBits = LIBC_NAMESPACE::fputil::FPBits<T>;
diff --git a/libc/test/src/math/smoke/FMaxTest.h b/libc/test/src/math/smoke/FMaxTest.h
index b8781a85d10f4f..439110b2beb29d 100644
--- a/libc/test/src/math/smoke/FMaxTest.h
+++ b/libc/test/src/math/smoke/FMaxTest.h
@@ -10,9 +10,10 @@
 #define LLVM_LIBC_TEST_SRC_MATH_SMOKE_FMAXTEST_H
 
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
-template <typename T> class FMaxTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T> class FMaxTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 
diff --git a/libc/test/src/math/smoke/FMaximumMagNumTest.h b/libc/test/src/math/smoke/FMaximumMagNumTest.h
index 715dd4ed913f83..db537ad28931cc 100644
--- a/libc/test/src/math/smoke/FMaximumMagNumTest.h
+++ b/libc/test/src/math/smoke/FMaximumMagNumTest.h
@@ -12,10 +12,11 @@
 #include "src/__support/FPUtil/BasicOperations.h"
 #include "src/__support/FPUtil/FPBits.h"
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 template <typename T>
-class FMaximumMagNumTest : public LIBC_NAMESPACE::testing::Test {
+class FMaximumMagNumTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 
diff --git a/libc/test/src/math/smoke/FMaximumMagTest.h b/libc/test/src/math/smoke/FMaximumMagTest.h
index 38276e0fe2fdb0..044a12123f1425 100644
--- a/libc/test/src/math/smoke/FMaximumMagTest.h
+++ b/libc/test/src/math/smoke/FMaximumMagTest.h
@@ -11,10 +11,11 @@
 
 #include "src/__support/FPUtil/BasicOperations.h"
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 template <typename T>
-class FMaximumMagTest : public LIBC_NAMESPACE::testing::Test {
+class FMaximumMagTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 
diff --git a/libc/test/src/math/smoke/FMaximumNumTest.h b/libc/test/src/math/smoke/FMaximumNumTest.h
index 57096f6b614a2c..81afaff6694e22 100644
--- a/libc/test/src/math/smoke/FMaximumNumTest.h
+++ b/libc/test/src/math/smoke/FMaximumNumTest.h
@@ -11,10 +11,11 @@
 
 #include "src/__support/FPUtil/FPBits.h"
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 template <typename T>
-class FMaximumNumTest : public LIBC_NAMESPACE::testing::Test {
+class FMaximumNumTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 
diff --git a/libc/test/src/math/smoke/FMaximumTest.h b/libc/test/src/math/smoke/FMaximumTest.h
index 4db8bb93baaeef..31861f440d152c 100644
--- a/libc/test/src/math/smoke/FMaximumTest.h
+++ b/libc/test/src/math/smoke/FMaximumTest.h
@@ -10,10 +10,11 @@
 #define LLVM_LIBC_TEST_SRC_MATH_SMOKE_FMAXIMUMTEST_H
 
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 template <typename T>
-class FMaximumTest : public LIBC_NAMESPACE::testing::Test {
+class FMaximumTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 
diff --git a/libc/test/src/math/smoke/FMinTest.h b/libc/test/src/math/smoke/FMinTest.h
index b1ffe38829f438..5484807b217182 100644
--- a/libc/test/src/math/smoke/FMinTest.h
+++ b/libc/test/src/math/smoke/FMinTest.h
@@ -10,9 +10,10 @@
 #define LLVM_LIBC_TEST_SRC_MATH_SMOKE_FMINTEST_H
 
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
-template <typename T> class FMinTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T> class FMinTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 
diff --git a/libc/test/src/math/smoke/FMinimumMagNumTest.h b/libc/test/src/math/smoke/FMinimumMagNumTest.h
index dec8b70740ca59..f29811403031d3 100644
--- a/libc/test/src/math/smoke/FMinimumMagNumTest.h
+++ b/libc/test/src/math/smoke/FMinimumMagNumTest.h
@@ -12,10 +12,11 @@
 #include "src/__support/FPUtil/BasicOperations.h"
 #include "src/__support/FPUtil/FPBits.h"
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 template <typename T>
-class FMinimumMagNumTest : public LIBC_NAMESPACE::testing::Test {
+class FMinimumMagNumTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 
diff --git a/libc/test/src/math/smoke/FMinimumMagTest.h b/libc/test/src/math/smoke/FMinimumMagTest.h
index b11092e5379ba0..a2daf6ad8119cc 100644
--- a/libc/test/src/math/smoke/FMinimumMagTest.h
+++ b/libc/test/src/math/smoke/FMinimumMagTest.h
@@ -11,10 +11,11 @@
 
 #include "src/__support/FPUtil/BasicOperations.h"
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 template <typename T>
-class FMinimumMagTest : public LIBC_NAMESPACE::testing::Test {
+class FMinimumMagTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 
diff --git a/libc/test/src/math/smoke/FMinimumNumTest.h b/libc/test/src/math/smoke/FMinimumNumTest.h
index 7fcc291b4c00cd..8036282d368507 100644
--- a/libc/test/src/math/smoke/FMinimumNumTest.h
+++ b/libc/test/src/math/smoke/FMinimumNumTest.h
@@ -11,10 +11,11 @@
 
 #include "src/__support/FPUtil/FPBits.h"
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 template <typename T>
-class FMinimumNumTest : public LIBC_NAMESPACE::testing::Test {
+class FMinimumNumTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 
diff --git a/libc/test/src/math/smoke/FMinimumTest.h b/libc/test/src/math/smoke/FMinimumTest.h
index bc04a6d9935654..9d3dc40dfc2b74 100644
--- a/libc/test/src/math/smoke/FMinimumTest.h
+++ b/libc/test/src/math/smoke/FMinimumTest.h
@@ -10,10 +10,11 @@
 #define LLVM_LIBC_TEST_SRC_MATH_SMOKE_FMINIMUMTEST_H
 
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 template <typename T>
-class FMinimumTest : public LIBC_NAMESPACE::testing::Test {
+class FMinimumTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 
diff --git a/libc/test/src/math/smoke/FModTest.h b/libc/test/src/math/smoke/FModTest.h
index bc909987a161b8..da5f502151cb34 100644
--- a/libc/test/src/math/smoke/FModTest.h
+++ b/libc/test/src/math/smoke/FModTest.h
@@ -12,6 +12,7 @@
 #include "src/__support/FPUtil/BasicOperations.h"
 #include "src/__support/FPUtil/NearestIntegerOperations.h"
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 #include "hdr/math_macros.h"
@@ -24,7 +25,7 @@
 
 #define TEST_REGULAR(x, y, expected) TEST_SPECIAL(x, y, expected, false, 0)
 
-template <typename T> class FmodTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T> class FmodTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 
diff --git a/libc/test/src/math/smoke/FloorTest.h b/libc/test/src/math/smoke/FloorTest.h
index 12944aa7756269..6f000d41395a0a 100644
--- a/libc/test/src/math/smoke/FloorTest.h
+++ b/libc/test/src/math/smoke/FloorTest.h
@@ -10,11 +10,12 @@
 #define LLVM_LIBC_TEST_SRC_MATH_SMOKE_FLOORTEST_H
 
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 #include "hdr/math_macros.h"
 
-template <typename T> class FloorTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T> class FloorTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 
diff --git a/libc/test/src/math/smoke/FmaTest.h b/libc/test/src/math/smoke/FmaTest.h
index c66035927d9896..ac82a1218b99ca 100644
--- a/libc/test/src/math/smoke/FmaTest.h
+++ b/libc/test/src/math/smoke/FmaTest.h
@@ -11,10 +11,11 @@
 
 #include "src/__support/FPUtil/FPBits.h"
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 template <typename T>
-class FmaTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class FmaTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 private:
   using Func = T (*)(T, T, T);
   using FPBits = LIBC_NAMESPACE::fputil::FPBits<T>;
diff --git a/libc/test/src/math/smoke/FrexpTest.h b/libc/test/src/math/smoke/FrexpTest.h
index bf99a9a559f053..cd70885deb332a 100644
--- a/libc/test/src/math/smoke/FrexpTest.h
+++ b/libc/test/src/math/smoke/FrexpTest.h
@@ -8,9 +8,10 @@
 
 #include "src/__support/FPUtil/BasicOperations.h"
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
-template <typename T> class FrexpTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T> class FrexpTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 
diff --git a/libc/test/src/math/smoke/FromfpTest.h b/libc/test/src/math/smoke/FromfpTest.h
index d3a61baafda106..6c7c7ad2afcbd5 100644
--- a/libc/test/src/math/smoke/FromfpTest.h
+++ b/libc/test/src/math/smoke/FromfpTest.h
@@ -10,10 +10,11 @@
 #define LIBC_TEST_SRC_MATH_SMOKE_FROMFPTEST_H
 
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 template <typename T>
-class FromfpTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class FromfpTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 
diff --git a/libc/test/src/math/smoke/FromfpxTest.h b/libc/test/src/math/smoke/FromfpxTest.h
index f3a1680b05aafc..344cb3345ef15f 100644
--- a/libc/test/src/math/smoke/FromfpxTest.h
+++ b/libc/test/src/math/smoke/FromfpxTest.h
@@ -10,10 +10,11 @@
 #define LIBC_TEST_SRC_MATH_SMOKE_FROMFPXTEST_H
 
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 template <typename T>
-class FromfpxTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class FromfpxTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 
diff --git a/libc/test/src/math/smoke/HypotTest.h b/libc/test/src/math/smoke/HypotTest.h
index a1b8f8a7fafa55..6cf6ca13428a5d 100644
--- a/libc/test/src/math/smoke/HypotTest.h
+++ b/libc/test/src/math/smoke/HypotTest.h
@@ -11,12 +11,13 @@
 
 #include "src/__support/FPUtil/FPBits.h"
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 #include "hdr/math_macros.h"
 
 template <typename T>
-class HypotTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class HypotTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 private:
   using Func = T (*)(T, T);
   using FPBits = LIBC_NAMESPACE::fputil::FPBits<T>;
diff --git a/libc/test/src/math/smoke/ILogbTest.h b/libc/test/src/math/smoke/ILogbTest.h
index bb5bc33b6b3a6d..05f906b69947b2 100644
--- a/libc/test/src/math/smoke/ILogbTest.h
+++ b/libc/test/src/math/smoke/ILogbTest.h
@@ -12,10 +12,11 @@
 #include "src/__support/CPP/limits.h" // INT_MAX
 #include "src/__support/FPUtil/FPBits.h"
 #include "src/__support/FPUtil/ManipulationFunctions.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 template <typename OutType, typename InType>
-class LlvmLibcILogbTest : public LIBC_NAMESPACE::testing::Test {
+class LlvmLibcILogbTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
   using FPBits = LIBC_NAMESPACE::fputil::FPBits<InType>;
   using StorageType = typename FPBits::StorageType;
 
diff --git a/libc/test/src/math/smoke/LdExpTest.h b/libc/test/src/math/smoke/LdExpTest.h
index c3e852a2a473b1..9c201302280aaf 100644
--- a/libc/test/src/math/smoke/LdExpTest.h
+++ b/libc/test/src/math/smoke/LdExpTest.h
@@ -13,12 +13,13 @@
 #include "src/__support/FPUtil/FPBits.h"
 #include "src/__support/FPUtil/NormalFloat.h"
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 #include <stdint.h>
 
 template <typename T>
-class LdExpTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class LdExpTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
   using FPBits = LIBC_NAMESPACE::fputil::FPBits<T>;
   using NormalFloat = LIBC_NAMESPACE::fputil::NormalFloat<T>;
   using StorageType = typename FPBits::StorageType;
diff --git a/libc/test/src/math/smoke/LogbTest.h b/libc/test/src/math/smoke/LogbTest.h
index 01e1050b4c4f8c..901a8e5cfeb6e7 100644
--- a/libc/test/src/math/smoke/LogbTest.h
+++ b/libc/test/src/math/smoke/LogbTest.h
@@ -8,9 +8,10 @@
 
 #include "src/__support/FPUtil/ManipulationFunctions.h"
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
-template <typename T> class LogbTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T> class LogbTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 
diff --git a/libc/test/src/math/smoke/ModfTest.h b/libc/test/src/math/smoke/ModfTest.h
index 65d61855c9f22d..0e2ed38afc5c72 100644
--- a/libc/test/src/math/smoke/ModfTest.h
+++ b/libc/test/src/math/smoke/ModfTest.h
@@ -9,11 +9,12 @@
 #include "src/__support/FPUtil/BasicOperations.h"
 #include "src/__support/FPUtil/NearestIntegerOperations.h"
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 #include "hdr/math_macros.h"
 
-template <typename T> class ModfTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T> class ModfTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 
diff --git a/libc/test/src/math/smoke/NextAfterTest.h b/libc/test/src/math/smoke/NextAfterTest.h
index d9c50c8109d803..f7785b9bfeb58d 100644
--- a/libc/test/src/math/smoke/NextAfterTest.h
+++ b/libc/test/src/math/smoke/NextAfterTest.h
@@ -15,6 +15,7 @@
 #include "src/__support/FPUtil/BasicOperations.h"
 #include "src/__support/FPUtil/FPBits.h"
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 #define ASSERT_FP_EQ_WITH_EXCEPTION(result, expected, expected_exception)      \
@@ -29,7 +30,7 @@
   ASSERT_FP_EQ_WITH_EXCEPTION(result, expected, FE_INEXACT | FE_OVERFLOW)
 
 template <typename T>
-class NextAfterTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class NextAfterTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
   using FPBits = LIBC_NAMESPACE::fputil::FPBits<T>;
   using StorageType = typename FPBits::StorageType;
 
diff --git a/libc/test/src/math/smoke/NextDownTest.h b/libc/test/src/math/smoke/NextDownTest.h
index c678ab1db1deff..e386370e733454 100644
--- a/libc/test/src/math/smoke/NextDownTest.h
+++ b/libc/test/src/math/smoke/NextDownTest.h
@@ -10,10 +10,11 @@
 #define LLVM_LIBC_TEST_SRC_MATH_NEXTDOWNTEST_H
 
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 template <typename T>
-class NextDownTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class NextDownTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 
diff --git a/libc/test/src/math/smoke/NextTowardTest.h b/libc/test/src/math/smoke/NextTowardTest.h
index b6c1c8d1797da6..2c1855eaccee8d 100644
--- a/libc/test/src/math/smoke/NextTowardTest.h
+++ b/libc/test/src/math/smoke/NextTowardTest.h
@@ -16,6 +16,7 @@
 #include "src/__support/FPUtil/BasicOperations.h"
 #include "src/__support/FPUtil/FPBits.h"
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 #define ASSERT_FP_EQ_WITH_EXCEPTION(result, expected, expected_exception)      \
@@ -30,7 +31,7 @@
   ASSERT_FP_EQ_WITH_EXCEPTION(result, expected, FE_INEXACT | FE_OVERFLOW)
 
 template <typename T>
-class NextTowardTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class NextTowardTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
   using FPBits = LIBC_NAMESPACE::fputil::FPBits<T>;
   using ToFPBits = LIBC_NAMESPACE::fputil::FPBits<long double>;
   using StorageType = typename FPBits::StorageType;
diff --git a/libc/test/src/math/smoke/NextUpTest.h b/libc/test/src/math/smoke/NextUpTest.h
index ebbdb5c73def9e..504e6540496970 100644
--- a/libc/test/src/math/smoke/NextUpTest.h
+++ b/libc/test/src/math/smoke/NextUpTest.h
@@ -10,10 +10,11 @@
 #define LLVM_LIBC_TEST_SRC_MATH_NEXTUPTEST_H
 
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 template <typename T>
-class NextUpTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class NextUpTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 
diff --git a/libc/test/src/math/smoke/RIntTest.h b/libc/test/src/math/smoke/RIntTest.h
index cbed9a3b10baab..6dffc6f4fe6329 100644
--- a/libc/test/src/math/smoke/RIntTest.h
+++ b/libc/test/src/math/smoke/RIntTest.h
@@ -12,6 +12,7 @@
 #include "src/__support/FPUtil/FEnvImpl.h"
 #include "src/__support/FPUtil/FPBits.h"
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 #include "hdr/fenv_macros.h"
@@ -22,7 +23,7 @@ static constexpr int ROUNDING_MODES[4] = {FE_UPWARD, FE_DOWNWARD, FE_TOWARDZERO,
                                           FE_TONEAREST};
 
 template <typename T>
-class RIntTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class RIntTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 public:
   typedef T (*RIntFunc)(T);
 
diff --git a/libc/test/src/math/smoke/RemQuoTest.h b/libc/test/src/math/smoke/RemQuoTest.h
index 7df537d8b20631..114c494b8a6b3b 100644
--- a/libc/test/src/math/smoke/RemQuoTest.h
+++ b/libc/test/src/math/smoke/RemQuoTest.h
@@ -13,10 +13,11 @@
 #include "src/__support/FPUtil/BasicOperations.h"
 #include "src/__support/FPUtil/FPBits.h"
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 template <typename T>
-class RemQuoTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class RemQuoTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
   using FPBits = LIBC_NAMESPACE::fputil::FPBits<T>;
   using StorageType = typename FPBits::StorageType;
 
diff --git a/libc/test/src/math/smoke/RoundEvenTest.h b/libc/test/src/math/smoke/RoundEvenTest.h
index e168d57bdbf3c7..ee7f0cb532e3ae 100644
--- a/libc/test/src/math/smoke/RoundEvenTest.h
+++ b/libc/test/src/math/smoke/RoundEvenTest.h
@@ -10,12 +10,13 @@
 #define LLVM_LIBC_TEST_SRC_MATH_SMOKE_ROUNDEVENTEST_H
 
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 #include "hdr/math_macros.h"
 
 template <typename T>
-class RoundEvenTest : public LIBC_NAMESPACE::testing::Test {
+class RoundEvenTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 
diff --git a/libc/test/src/math/smoke/RoundTest.h b/libc/test/src/math/smoke/RoundTest.h
index 49b2a1bf7dfba7..9ef455f093b45e 100644
--- a/libc/test/src/math/smoke/RoundTest.h
+++ b/libc/test/src/math/smoke/RoundTest.h
@@ -10,11 +10,12 @@
 #define LLVM_LIBC_TEST_SRC_MATH_SMOKE_ROUNDTEST_H
 
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 #include "hdr/math_macros.h"
 
-template <typename T> class RoundTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T> class RoundTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 
diff --git a/libc/test/src/math/smoke/RoundToIntegerTest.h b/libc/test/src/math/smoke/RoundToIntegerTest.h
index 863cf75f05ff6b..da5fe759270a0c 100644
--- a/libc/test/src/math/smoke/RoundToIntegerTest.h
+++ b/libc/test/src/math/smoke/RoundToIntegerTest.h
@@ -12,6 +12,7 @@
 #include "src/__support/FPUtil/FEnvImpl.h"
 #include "src/__support/FPUtil/FPBits.h"
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 #include "hdr/math_macros.h"
@@ -21,7 +22,7 @@ static constexpr int ROUNDING_MODES[4] = {FE_UPWARD, FE_DOWNWARD, FE_TOWARDZERO,
                                           FE_TONEAREST};
 
 template <typename F, typename I, bool TestModes = false>
-class RoundToIntegerTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class RoundToIntegerTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 public:
   typedef I (*RoundToIntegerFunc)(F);
 
@@ -61,6 +62,8 @@ class RoundToIntegerTestTemplate : public LIBC_NAMESPACE::testing::Test {
 
 public:
   void SetUp() override {
+    LIBC_NAMESPACE::testing::FEnvSafeTest::SetUp();
+
     if (math_errhandling & MATH_ERREXCEPT) {
       // We will disable all exceptions so that the test will not
       // crash with SIGFPE. We can still use fetestexcept to check
diff --git a/libc/test/src/math/smoke/SqrtTest.h b/libc/test/src/math/smoke/SqrtTest.h
index 46382ed58e1402..111468913a485a 100644
--- a/libc/test/src/math/smoke/SqrtTest.h
+++ b/libc/test/src/math/smoke/SqrtTest.h
@@ -8,11 +8,12 @@
 
 #include "src/__support/CPP/bit.h"
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 #include "hdr/math_macros.h"
 
-template <typename T> class SqrtTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T> class SqrtTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 
diff --git a/libc/test/src/math/smoke/TruncTest.h b/libc/test/src/math/smoke/TruncTest.h
index c0fc87f9313b2f..88c08f4ecf9dbb 100644
--- a/libc/test/src/math/smoke/TruncTest.h
+++ b/libc/test/src/math/smoke/TruncTest.h
@@ -10,11 +10,12 @@
 #define LLVM_LIBC_TEST_SRC_MATH_SMOKE_TRUNCTEST_H
 
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 #include "hdr/math_macros.h"
 
-template <typename T> class TruncTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T> class TruncTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 
diff --git a/libc/test/src/math/smoke/UfromfpTest.h b/libc/test/src/math/smoke/UfromfpTest.h
index 9ad1e6dce94596..561b52943179a6 100644
--- a/libc/test/src/math/smoke/UfromfpTest.h
+++ b/libc/test/src/math/smoke/UfromfpTest.h
@@ -10,10 +10,11 @@
 #define LIBC_TEST_SRC_MATH_SMOKE_UFROMFPTEST_H
 
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 template <typename T>
-class UfromfpTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class UfromfpTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 
diff --git a/libc/test/src/math/smoke/UfromfpxTest.h b/libc/test/src/math/smoke/UfromfpxTest.h
index 09163b8adfa5c0..1e829f87ca379d 100644
--- a/libc/test/src/math/smoke/UfromfpxTest.h
+++ b/libc/test/src/math/smoke/UfromfpxTest.h
@@ -10,10 +10,11 @@
 #define LIBC_TEST_SRC_MATH_SMOKE_UFROMFPXTEST_H
 
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 template <typename T>
-class UfromfpxTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class UfromfpxTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 
diff --git a/libc/test/src/math/smoke/nan_test.cpp b/libc/test/src/math/smoke/nan_test.cpp
index 56c1e9164df41a..41ca31daaaf725 100644
--- a/libc/test/src/math/smoke/nan_test.cpp
+++ b/libc/test/src/math/smoke/nan_test.cpp
@@ -9,10 +9,11 @@
 #include "src/__support/FPUtil/FPBits.h"
 #include "src/math/nan.h"
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 #include <signal.h>
 
-class LlvmLibcNanTest : public LIBC_NAMESPACE::testing::Test {
+class LlvmLibcNanTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 public:
   using StorageType = LIBC_NAMESPACE::fputil::FPBits<double>::StorageType;
 
diff --git a/libc/test/src/math/smoke/nanf128_test.cpp b/libc/test/src/math/smoke/nanf128_test.cpp
index 652e35ccb53d7a..2119f9c0a8c2bf 100644
--- a/libc/test/src/math/smoke/nanf128_test.cpp
+++ b/libc/test/src/math/smoke/nanf128_test.cpp
@@ -10,9 +10,10 @@
 #include "src/__support/uint128.h"
 #include "src/math/nanf128.h"
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
-class LlvmLibcNanf128Test : public LIBC_NAMESPACE::testing::Test {
+class LlvmLibcNanf128Test : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 public:
   using FPBits128 = LIBC_NAMESPACE::fputil::FPBits<float128>;
   using StorageType = FPBits128::StorageType;
diff --git a/libc/test/src/math/smoke/nanf_test.cpp b/libc/test/src/math/smoke/nanf_test.cpp
index bce495f1a9738b..9a5d90a9748bde 100644
--- a/libc/test/src/math/smoke/nanf_test.cpp
+++ b/libc/test/src/math/smoke/nanf_test.cpp
@@ -9,10 +9,11 @@
 #include "src/__support/FPUtil/FPBits.h"
 #include "src/math/nanf.h"
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 #include <signal.h>
 
-class LlvmLibcNanfTest : public LIBC_NAMESPACE::testing::Test {
+class LlvmLibcNanfTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 public:
   using StorageType = LIBC_NAMESPACE::fputil::FPBits<float>::StorageType;
 
diff --git a/libc/test/src/math/smoke/nanl_test.cpp b/libc/test/src/math/smoke/nanl_test.cpp
index 5ff70a94b54d31..0af724631f892c 100644
--- a/libc/test/src/math/smoke/nanl_test.cpp
+++ b/libc/test/src/math/smoke/nanl_test.cpp
@@ -9,6 +9,7 @@
 #include "src/__support/FPUtil/FPBits.h"
 #include "src/math/nanl.h"
 #include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 #include <signal.h>
 
@@ -22,7 +23,7 @@
 #error "Unknown long double type"
 #endif
 
-class LlvmLibcNanlTest : public LIBC_NAMESPACE::testing::Test {
+class LlvmLibcNanlTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 public:
   using StorageType = LIBC_NAMESPACE::fputil::FPBits<long double>::StorageType;
 



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